# Fuel Efficiency - Miles per Gallon to Kilometer per Liter

**Formula:**`km_per_liter = miles_per_gallon × 0.425144`

## Introduction to Fuel Efficiency Conversion

This tool calculates the fuel efficiency of a vehicle in kilometers per liter (km/L) given its efficiency in miles per gallon (MPG). It is useful for comparing fuel efficiency in countries that use different measurements.

## Parameter usage:

`milesPerGallon`

= fuel efficiency in miles per gallon

## Example valid values:

`milesPerGallon`

= 35`milesPerGallon`

= 60

## Output:

`km_per_liter`

= fuel efficiency in kilometers per liter

## Data validation

The miles per gallon value must be a number and cannot be negative, reflecting real-world usage.

## Summary

Converts MPG to KM/L, facilitating international fuel efficiency comparisons. The conversion factor used is **0.425144**, derived from the ratio of miles to kilometers (1 mile = 1.60934 km) and liters to gallons (1 gallon = 3.78541 liters).

Tags: Fuel Efficiency, Conversion, MPG, L